III B.Tech I Semester Supplementary Examinations, November 2006 POWDER METALLURGY (Metallurgy & Material Technology) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Define ’Powder Metallurgy’. Explain how powder metallurgy is different and advantageous to other manufacturing processes? [8] (b) Explain with the help of neat flow chart, the basic steps involved in powder metallurgy. [8]
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2. Explain the following powder production methods. Give the characteristics of the powders thus produced. (a) Production of iron powder by reduction of mill scale
(b) Production of Ni powders by thermal decomposition (c) Production of atomized iron powders
(d) Production of Cu powders by rotating electrode process (REP)
[4*4=16]
3. (a) Classify and describe powder particle shapes.
[4]
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(b) Explain the following particle size measurement techniques. i. Sedimentation and ii. Elutriation
[6]
(c) How particle shape and size are measured by microscopic techniques.
[6]
4. (a) Explain the following Powder Characteristics Chemical Composition and Structure. Surface topography. Flow rate and Apparent density and tap density.
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i. ii. iii. iv.
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(b) Explain how metal powders are stored to prevent them from pyrophoric and toxic behaviour. [2]
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(c) Explain why metal powders are subjected to annealing treatment and when? [2]
5. (a) Classify compaction methods and explain various process variables to distinguish various compaction techniques. [4] (b) List out various types of die compaction techniques and mention their merits and demerits. [8] (c) Explain Isostatic compaction and give its advantages. 1 of 2
[4]
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Code No: NR311802 6. (a) Describe the behaviour of metal powder during compaction.
[6]
(b) Define Sintering and how is it different from hot pressing.
[4]
(c) Explain Sintering process with the help of various stages.
[6]
7. (a) Explain the various zones of sintering furnace with respect to their role and operation. [6] (b) Explain various methods of conveying compacts to the sintering furnace? [4]
8. Write short notes on the following: (a) Manufacture of cermets and their applications. (c) Production of bronze filters
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(b) Manufacture of Self - Lubricating bearings.
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(c) What are the funcitons of sintering atmospheres and explain the characteristics of various sintering atmospheres. [6]
(d) Powder Metallurgy processing of materials for aerospace applications.
NR311802 III B.Tech I Semester Supplementary Examinations ...
(b) Explain the following particle size measurement techniques. i. Sedimentation ... compaction. [6]. (b) Define Sintering and how is it different from hot pressing.
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III B.Tech I Semester Supplementary Examinations, November 2005. POWER ELECTRONICS · (Electrical & Electronic Engineering) · Time: 3 hours · Max Marks: 80 · Answer any FIVE Questions · All Questions carry equal marks · ***** · 1. (a) Explain the oper
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